(2/26)解方程:(20x-16)(360-50x)=1920

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(2/26)解方程:(20x-16)(360-50x)=1920
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(2/26)解方程:(20x-16)(360-50x)=1920
(2/26)解方程:(20x-16)(360-50x)=1920

(2/26)解方程:(20x-16)(360-50x)=1920
(20x-16)(360-50x)=1920
7200x-1000x平方-5760+800x=1920
x平方-8x+16-16+7.68=0
(X-4)平方=8.32
x=4±根号(8.32)=4±2.884441
x1=4+2.884441=6.884441;
X2=4-2.884441=1.115559